LM7301: Difference in current drain (with same load)

Hi Trukesh, 

Trukesh Nadarajan said:

Would like to understand the current drain difference (operating) between the parts from the 2 sites. Supply Voltage vs Current (Input/Output). Roughly we are seeing about ~25mA increase with Post PCN part under same design/load configuration compared to Pre-PCN part 

LM7301 is issued the following PCN due to FAB change. Your observation is related to the differences of the op amp due to FAB change. 

https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/4803/PCN20221216011.1.pdf

https://www.mouser.com/PCN/Texas_Instruments_PCN20230328000_20230330042832132.pdf

If you are able to show me the op amp circuit, I am able to compensate for you. These are two equivalent op amps, and it is likely that the op amp in the new FAB has slightly different open loop output impedance and BW differences, which it results the behavior. In other words, it is likely that the op amp in the new FAB requires a slight different compensation scheme. 

If you do not want to post the schematic in the open forum, you may post "friendship" request and we can discuss the issues in the private E2E messaging forum. 

If you have other questions, please let me know. 

Best,

Raymond

Hi,

Prefer not to share the schematic in the open forum. Thus would like to proceed for private E2E msg.

And if there is different open loop impedance and BW differences, why it is not captured or differentiated in the datasheet?

Thanks

Hi Trukesh, 

Please post "friendship" request over E2E forum, and we can discuss the issues in the private E2E messaging forum once the communication is established. 

Best,

Raymond